Renesas R7F123FLG4AFB-C#BA0

Overview

R7F123FLG4AFB-C#BA0 from Renesas Electronics is a 16-bit RL78/F23 microcontroller in 64-pin LQFP package, featuring 256 KB flash, 20 KB RAM, and integrated 12-bit ADC, 16-bit timer arrays, and LIN/UART/SPI/I²C interfaces. It operates at up to 32 MHz, supports 1.6–5.5 V supply, and targets low-power industrial control and automotive body electronics.

For engineers reviewing the R7F123FLG4AFB-C#BA0 datasheet, R7F123FLG4AFB-C#BA0 pinout, R7F123FLG4AFB-C#BA0 application, or R7F123FLG4AFB-C#BA0 equivalent, key selection criteria include its 64-pin LQFP-0.5mm pitch package, 256 KB on-chip flash with ECC, 12-bit ADC with 24 channels, LIN v2.2 compliance, and support for Renesas E2 Emulator debugging.

Technical Context

The R7F123FLG4AFB-C#BA0 implements the RL78 CPU core with 3-stage pipeline, CISC architecture, and 16-bit data bus. It integrates a 16-bit multi-function timer (MTU), 16-bit real-time clock (RTC), and 12-bit A/D converter with sample-and-hold and window comparison functions.

On-chip peripherals include LIN controller supporting master/slave modes, UART with smart card interface, SPI with dual-buffer mode, I²C with SMBus compatibility, and 16-channel DMA controller. Power management includes HALT, STOP, and ultra-low-power SNOOZE modes with wake-up via interrupt or peripheral event.

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with R7F123FLG4AFB-C#BA0, the R7F123FLG4AFP-C#BA0 offers identical functionality in a mechanically incompatible package, while the R7F124FLJ4AFB-C#AA0 extends capability with CAN FD and larger memory-neither is pin-compatible, and both require firmware and layout validation.

Availability

R7F123FLG4AFB-C#BA0 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart home HVAC controllers, and medical diagnostic equipment interface designs requiring stable component supply and long-term lifecycle support.

Supply support for R7F123FLG4AFB-C#BA0 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The RL78/F23 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and functional-safety-aware applications in automotive body electronics and industrial control.

FAQ

What is the maximum operating frequency of the R7F123FLG4AFB-C#BA0?

The R7F123FLG4AFB-C#BA0 supports a maximum CPU clock frequency of 32 MHz using the high-speed on-chip oscillator (HOCO) or external crystal. When configured with PLL, it maintains full peripheral functionality at this rate. The device also supports lower-frequency modes (e.g., 32.768 kHz sub-clock for RTC) to optimize power consumption in sleep states. All timing specifications in the datasheet assume operation within this 32 MHz limit.

Does the R7F123FLG4AFB-C#BA0 include hardware support for functional safety standards?

Yes, the R7F123FLG4AFB-C#BA0 includes several hardware features aligned with IEC 61508 SIL2 and ISO 26262 ASIL-B requirements: flash ECC and RAM parity, built-in self-test (BIST) for memory, independent watchdog timer with dedicated clock source, and lockstep-capable peripherals such as the ADC and timers. These features are documented in Renesas' Functional Safety Manual for RL78/F23 and must be enabled and verified per application-specific safety plan.

Can the R7F123FLG4AFB-C#BA0 operate from a single 3.3 V supply?

Yes, the R7F123FLG4AFB-C#BA0 operates across a wide supply range of 1.6 V to 5.5 V, making 3.3 V a fully supported and commonly used nominal voltage. At 3.3 V, it achieves full 32 MHz performance with guaranteed timing margins. The internal voltage regulator supplies stable core voltage regardless of input variation, and AVDD/AVSS pins must be decoupled separately to ensure ADC accuracy under this condition.

How many I/O pins does the R7F123FLG4AFB-C#BA0 provide in its 64-pin LQFP package?

The R7F123FLG4AFB-C#BA0 in 64-pin LQFP provides 54 general-purpose I/O pins, excluding power, ground, reset, REGC, and dedicated debug pins. These include 8-bit Port 0 through Port 9 (with some pins shared with analog functions), plus additional dedicated pins for LIN, UART, SPI, and I²C. Pin multiplexing is configurable via register settings, and unused pins can be set to high-impedance or pulled internally per Renesas' recommended handling guidelines.

Is the R7F123FLG4AFB-C#BA0 compatible with Renesas E2 Emulator for debugging?

Yes, the R7F123FLG4AFB-C#BA0 is fully supported by the Renesas E2 Emulator and E2 Lite Emulator via the single-wire debug (SWD) interface using the dedicated DEBUG pin (pin 63 in 64-pin LQFP). Firmware updates, real-time tracing, and breakpoint debugging are all enabled without requiring additional hardware adapters. The emulator connects directly to the target board using standard 10-pin or 20-pin connectors specified in the E2 Emulator User's Manual (R20UT3538E).